Definition of retina

: the sensory membrane that lines the eye, is composed of several layers including one containing the rods and cones, and functions as the immediate instrument of vision by receiving the image formed by the lens and converting it into chemical and nervous signals which reach the brain by way of the optic nerve — see eye illustration

Shannon says the vision loss in her right eye is the result of childhood cataracts that were never properly treated, and her left was damaged by retinal detachment, a disorder of the eye in which the retina separates from the layer underneath.

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Medical Dictionary

retina

medical
Definition of retina

: the sensory membrane that lines most of the large posterior chamber of the vertebrate eye, is composed of several layers including one containing the rods and cones, and functions as the immediate instrument of vision by receiving the image formed by the lens and converting it into chemical and nervous signals which reach the brain by way of the optic nerve